4.8 Article

Fabrication of metal-organic framework-based nanofibrous separator via one-pot electrospinning strategy

Journal

NANO RESEARCH
Volume 14, Issue 5, Pages 1465-1470

Publisher

TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-3203-0

Keywords

one-pot electrospinning strategy; metal-organic framework; composite nanofibrous membrane; battery separator

Funding

  1. State Key Laboratory of Chemical Engineering at Zhejiang University [SKL-ChE-20D01]
  2. Program for Guangdong Introducing Innovative and Entrepreneurial Teams [2017ZT07C291]
  3. Shenzhen Science and Technology Program [KQTD20170810141424366]
  4. Special Program for Central Government Guiding Local Science and Technology Development: Environmental Purification Functional Materials Research Platform
  5. Shenzhen Key Laboratory of Advanced Materials Product Engineering [ZDSYS20190911164401990]

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A facile one-pot electrospinning strategy was proposed for preparing Metal-Organic Framework (MOF)/polymer composite materials, which exhibited uniform MOF distribution and good mechanical properties. The composite membranes, used as separators in Li-metal batteries, demonstrated significantly improved cycling performance under harsh testing conditions. This improvement was attributed to enhanced wettability and a uniform lithium ion flux stabilized by the open metal sites of uniformly distributed MOF particles in the membrane.
Metal-organic framework (MOF)/polymer composites have attracted extensive attention in the recent years. However, it still remains challenging to efficiently and effectively fabricate these composite materials. In this study, we propose a facile one-pot electrospinning strategy for preparation of HKUST-1/polyacrylonitrile (PAN) nanofibrous membranes from a homogeneous stock solution containing HKUST-1 precursors and PAN. MOF crystallization and polymer solidification occur simultaneously during the electrospinning process, thus avoiding the issues of aggregation and troublesome multistep fabrication of the conventional approach. The obtained HKUST-1/PAN electrospun membranes show uniform MOF distribution throughout the nanofibers and yield good mechanical properties. The membranes are used as separators in Li-metal full batteries under harsh testing conditions, using an ultrathin Li-metal anode, a high mass loading cathode, and the HKUST-1/PAN nanofibrous separator. The results demonstrate significantly improved cycling performance (capacity retention of 83.1% after 200 cycles) under a low negative to positive capacity ratio (N/P ratio of 1.86). The improvement can be attributed to an enhanced wettability of the separator towards electrolyte stemmed from the nanofibrous structure, and a uniform lithium ion flux stabilized by the open metal sites of uniformly distributed HKUST-1 particles in the membrane during cycling.

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